Look into what I said before, Peter, at about 2300 BCE at about the time of Sargon the Great (or slightly after) there came a greater emphasis on masculinity which doesn't seem evident before. With portraits of Narin Sin you can see it clearly, muscular bodies. The Hittite sculptures express the same. Into the Middle-Bronze Age there appears to have been a diminishing of female rights in Mesopotamian culture, and an emphasis on war-on the warrior. By the Iron Age it is expressed in violent male gods. So a view of masculinity as aggressive, violent and physically strong.